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Did you open the case on your computer? It may have an open case alarm which is a small switch typically located near the edge of the cover you removed. Make sure the case cover is completely installed, then see if the alarm goes off.
if you have installed a new hardware, that might be the cause. specially if it is a video card. The wattage of your power supply might not be enough to run the computer. try to remove newly installed hardware such as video card. If there is none, you may try to remove the power for the hard drive and the dvd drive and check if it will turn on. Just bood in to bios..
if that works, then it definitely is the power supply. it cant provide sufficient power to your equipment..
Is the light more amber or more green? If you push the button and it goes amber, then you probably have a bad power supply. Try getting another power supply to test. If that doesn't solve the problem, then you probably have a bad motherboard.
This is a case where something that is getting switched on during start-up is causing the power supply to fail... probably due to a short. How ever I believe the short is in the power supply
This is an older HP model ( I have a 530N) with teh same problem. I bought a new power supply and installed it.
inside the pc there should be a green light. called flea light. if its not on.. then id say motherboard or power supply are bad. take power cord off. and hold power button down for 10 ecs. then reconnect and retry. i think its abad psu.
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